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Earnings (Loss) Per Share (Basic and Diluted Earnings) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Earnings (Loss) Per Share [Abstract]
Net income (loss)	$ 46,120	$ (26,432)
Weighted average number of common shares outstanding	28,750	29,893
Dilutive stock awards	100	0
Diluted weighted average number of common shares outstanding	28,850	29,893
Basic earnings (loss) per share	$ 1.60	$ (0.88)
Diluted earnings (loss) per share	$ 1.60	$ (0.88)

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- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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